| 摘要 |
<p>The invention relates to an injection and dosing device (1), in particular for injecting a fluid into an exhaust tract of a combustion engine, comprising a compression and injection space (14), which is designed to receive the fluid to be injected and has at least one injection opening (22); a movable pressure element (4), which is designed such that the pressure in the compression and injection space (14) can be varied by moving the pressure element (4) between an intake position, in which the pressure in the compression and injection space (14) is at a minimum, and an injection position, in which the pressure in the compression and injection space (14) is at a maximum; and a closing element (10), which can be moved between a closing position, in which said element closes the injection opening (22), and an open position, in which said element exposes the injection opening (22). The pressure element (4) and the closing element (10) are coupled via at least two mechanisms of action that are independent of each other, and each of the independent mechanisms of action is capable on its own of having the effect that a movement of the pressure element (4) from the intake position into the pressure position results in a movement of the closing element (10) from the closing position into an open position.</p> |
